Ver 1 :: Have a coin audibly disappear from the card box that the spectator is holding onto and have the coin appear on top of there chosen signed card. The cards know where near the box when it disappears! Ver 2 :: Visually have a signed borrowed coin, melt through the top of deck right before there eyes, to have it sink half way through the other cards and land on there chosen signed card... that the spectator cut to!